package com.rest;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URLEncoder;
import java.util.ArrayList;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;

import com.bpack.LoginActivity.RequestMethod;

/**
 * BpackConnect
 * HTTP client used to POST and GET information from the web service.
 * @author Daranhdara Hun
 */
public class BpackConnect {
	private ArrayList <NameValuePair> params;
	private ArrayList <NameValuePair> headers;
	private String url;
	private int responseCode;
	private String message;
	private String response;

	/**
	 * getResponse - Getter
	 * @return response - Could be token or whatever you're requesting
	 */
	public String getResponse() {
		return response;
	}

	/**
	 * getErrorMessage - Getter
	 * @return message
	 */
	public String getErrorMessage() {
		return message;
	}

	/**
	 * getResponseCode - Getter
	 * @return responseCode
	 */
	public int getResponseCode() {
		return responseCode;
	}

	/**
	 * BpackConnect - setter
	 * Sets the private variable url as well as instantiates params and headers
	 * @param url
	 */
	public BpackConnect(String url)
	{
		this.url = url;
		params = new ArrayList<NameValuePair>();
		headers = new ArrayList<NameValuePair>();
	}

	/**
	 * AddParam
	 * Adds parameters
	 * @param name - name of parameter
	 * @param value - value of parameter
	 */
	public void AddParam(String name, String value)
	{
		params.add(new BasicNameValuePair(name, value));
	}

	/**
	 * AddHeader
	 * Adds headers
	 * @param name - name of header
	 * @param value - value of header
	 */
	public void AddHeader(String name, String value)
	{
		headers.add(new BasicNameValuePair(name, value));
	}

	/**
	 * Execute
	 * Packages request with headers and parameters 
	 * Calls actual request method
	 * @param method - Either POST or GET
	 * @throws Exception
	 */
	public void Execute(RequestMethod method) throws Exception
	{
		switch(method) {
		case GET:
		{
			//add parameters
			String combinedParams = "";
			if(!params.isEmpty()){
				combinedParams += "?";
				for(NameValuePair p : params)
				{
					String paramString = p.getName() + "=" + URLEncoder.encode(p.getValue(),"UTF-8");
					if(combinedParams.length() > 1)
					{
						combinedParams  +=  "&" + paramString;
					}
					else
					{
						combinedParams += paramString;
					}
				}
			}

			HttpGet request = new HttpGet(url + combinedParams);

			//add headers
			for(NameValuePair h : headers)
			{
				request.addHeader(h.getName(), h.getValue());
			}

			executeRequest(request, url);
			break;
		}
		case POST:
		{
			HttpPost request = new HttpPost(url);

			//add headers
			for(NameValuePair h : headers)
			{
				request.addHeader(h.getName(), h.getValue());
			}

			if(!params.isEmpty()){
				request.setEntity(new UrlEncodedFormEntity(params));//, HTTP.UTF_8));
			}
			
			executeRequest(request, url);
			break;
		}
		}
	}

	/**
	 * Executes the actual request to the web service
	 * @param request - The request object
	 * @param url - URL
	 */
	private void executeRequest(HttpUriRequest request, String url)
	{
		HttpClient client = new DefaultHttpClient();

		HttpResponse httpResponse;

		try {
			httpResponse = client.execute(request);
			responseCode = httpResponse.getStatusLine().getStatusCode();
			message = httpResponse.getStatusLine().getReasonPhrase();

			HttpEntity entity = httpResponse.getEntity();

			if (entity != null) {
				InputStream instream = entity.getContent();

				//Here is the token
				/*"response"	{"access_token":"3275c6223b1a43ce13cc2ea0be91f95a","expires_in":3600,"scope":null,"refresh_token":"296cd47e2a0dc7a268697286c9d12416"}\n	*/
				response = convertStreamToString(instream);

				// Closing the input stream will trigger connection release
				instream.close();
			}

		} catch (ClientProtocolException e)  {
			client.getConnectionManager().shutdown();
			e.printStackTrace();
		} catch (IOException e) {
			client.getConnectionManager().shutdown();
			e.printStackTrace();
		}
	}

	/**
	 * convertStreamToString
	 * Does exactly what it say!
	 * @param is - InputStrim object
	 * @return The string form of the object
	 */
	private static String convertStreamToString(InputStream is) {

		BufferedReader reader = new BufferedReader(new InputStreamReader(is));
		StringBuilder sb = new StringBuilder();

		String line = null;
		try {
			while ((line = reader.readLine()) != null) {
				sb.append(line + "\n");
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				is.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return sb.toString();
	}
}

